day 27 网络通信协议 tup udp 下的socket

1.osi七层模型

通信流程

socket(抽象层):

结合上图来看，socket在哪一层呢，我们继续看下图

socket在内的五层通讯流程：

2.TCP/UDP的区别:

TCP是以数据流的形式传输,UDP打包成数据包传输(传输速度快容易丢包,用作视频通话等)

3.paython中TCP/UDP协议下的socket对比:

代码(UDP):

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服务器端:

import socket

udp_server = socket.socket(type=socket.SOCK_DGRAM) #datagram

ip_port = ('127.0.0.1',8002)
udp_server.bind(ip_port)

from_client_msg,client_addr = udp_server.recvfrom(1024)

udp_server.sendto(b'gunduzi',client_addr)

print(from_client_msg,client_addr)

客户端

import socket
udp_client = socket.socket(type=socket.SOCK_DGRAM)
ip_port = ('127.0.0.1',8002)
udp_client.sendto(b'hello',ip_port)

from_server_msg,server_addr = udp_client.recvfrom(1024)
print(from_server_msg,server_addr)

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多人通话服务器端

import socket

udp_server = socket.socket(type=socket.SOCK_DGRAM) #datagram

ip_port = ('127.0.0.1',8002)

udp_server.bind(ip_port)

while 1:

from_client_msg, client_addr = udp_server.recvfrom(1024)

print(from_client_msg.decode('utf-8'), client_addr)

to_client_msg = input('服务端说:')
udp_server.sendto(to_client_msg.encode('utf-8'), client_addr)

udp_server.close()

多人通话客户端

import socket
udp_client = socket.socket(type=socket.SOCK_DGRAM)
ip_port = ('127.0.0.1',8002)

while 1:
to_server_msg = input('客户端说')
udp_client.sendto(to_server_msg.encode('utf-8'), ip_port)

from_server_msg, server_addr = udp_client.recvfrom(1024)
print(from_server_msg.decode('utf-8'), server_addr)

udp_client.close()

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